Gradient Vector Flow: A New External Force for Snakes
نویسندگان
چکیده
Snakes, or active contours, are used extensively in computer vision and image processing applications, particularly to locate object boundaries. Problems associated with initialization and poor convergence to concave boundaries, however, have limited their utility. This paper develops a new external force for active contours, largely solving both problems. This external force, which we call gradient vector flow (GVF), is computed as a diffusion of the gradient vectors of a gray-level or binary edge map derived from the image. The resultant field has a large capture range and forces active contours into concave regions. Examples on simulated images and one real image are presented.
منابع مشابه
Snakes, shapes, and gradient vector flow
Snakes, or active contours, are used extensively in computer vision and image processing applications, particularly to locate object boundaries. Problems associated with initialization and poor convergence to boundary concavities, however, have limited their utility. This paper presents a new external force for active contours, largely solving both problems. This external force, which we call g...
متن کاملMean Shifting Gradient Vector Flow: An Improved External Force Field for Active Surfaces in Widefield Microscopy
Gradient vector flow based snakes are a very common method in biomedical image segmentation. The use of gradient vector flow herein brings some major advantages like a large capture range to strong gradients and a good adaption of the snakes in concave regions. In some cases though, the application of gradient vector flow can also have undesired effects, e.g. if only parts of an image are stron...
متن کاملImproving Concavity Performance of Snake Algorithms
Poor convergence to concave boundaries is a limitation in the use of snakes as a contour approximation technique. The external force for active contours, called gradient vector flow (GVF), has provided a remarkable improvement to this problem. However, the technique requires high computation time for reliable concavity performance. In this paper, we propose an efficient solution to overcome the...
متن کاملA Fast External Force Field for Parametric Active Contour Segmentation
Active contours or snakes are widely used for segmentation and tracking. We propose a new active contour model, which converges reliably even when the initialization is far from the object of interest. The proposed segmentation technique uses an external energy function where the energy slowly decreases in the vicinity of an edge. Based on this energy a new external force field is defined. Both...
متن کاملCurvature Vector Flow to Assure Convergent Deformable Models for Shape Modelling
Poor convergence to concave shapes is a main limitation of snakes as a standard segmentation and shape modelling technique. The gradient of the external energy of the snake represents a force that pushes the snake into concave regions, as its internal energy increases when new in exion points are created. In spite of the improvement of the external energy by the gradient vector ow technique, hi...
متن کامل